[PATCH rdma-next v4] RDMA: Change capability fields in ib_device_attr from int to u32

[Erni Sri Satya Vennela]

The capability counter fields in struct ib_device_attr are declared
as signed int, but these values are inherently non-negative. Drivers
maintain their cached caps as u32 and assign them directly into these
int fields; if a cap exceeds INT_MAX the implicit narrowing yields a
negative value visible to the IB core.

Change the signed int capability fields to u32 to match the
underlying nature of the data.

Suggested-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Erni Sri Satya Vennela <ernis@xxxxxxxxxxxxxxxxxxx>
---
Changes in v4:
* Drop clamping the values in mana_ib_query_device, instead update
  the props values from int to u32.
Changes in v3:
* Drop clamping from mana_ib_gd_query_adapter_caps(). The internal u32
  caps cache does not need to be clamped.
* Move all clamping exclusively to mana_ib_query_device(), which is the
  only place the cached u32 values are narrowed into the signed int
  fields of struct ib_device_attr.
* Reframe commit message: this is a u32-to-int type boundary fix, not a
  CVM/untrusted-hardware hardening patch.
Changes in v2:
* Update patch title.
---
 include/rdma/ib_verbs.h | 24 ++++++++++++------------
 1 file changed, 12 insertions(+), 12 deletions(-)

diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 9dd76f489a0b..805ae294963c 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -406,21 +406,21 @@ struct ib_device_attr {
 	u32			vendor_id;
 	u32			vendor_part_id;
 	u32			hw_ver;
-	int			max_qp;
-	int			max_qp_wr;
+	u32			max_qp;
+	u32			max_qp_wr;
 	u64			device_cap_flags;
 	u64			kernel_cap_flags;
-	int			max_send_sge;
-	int			max_recv_sge;
-	int			max_sge_rd;
-	int			max_cq;
-	int			max_cqe;
-	int			max_mr;
-	int			max_pd;
-	int			max_qp_rd_atom;
+	u32			max_send_sge;
+	u32			max_recv_sge;
+	u32			max_sge_rd;
+	u32			max_cq;
+	u32			max_cqe;
+	u32			max_mr;
+	u32			max_pd;
+	u32			max_qp_rd_atom;
 	int			max_ee_rd_atom;
-	int			max_res_rd_atom;
-	int			max_qp_init_rd_atom;
+	u32			max_res_rd_atom;
+	u32			max_qp_init_rd_atom;
 	int			max_ee_init_rd_atom;
 	enum ib_atomic_cap	atomic_cap;
 	enum ib_atomic_cap	masked_atomic_cap;
-- 
2.34.1